210 



THE MONTHLY BULLETIN. 



Surgery. 



Tree surgery has been occasionally successfully used in treating 

 orchard trees. Its use is, however, limited to the crown and upper 

 roots of the tree. The work requires considerable care to be efficient. 

 The discouraging part of the work is that the gall sometimes grows 

 again at the margin of the treated area, when a second treatment is 

 necessary. A good germicide should be used on the treated surface. 

 A commercial preparation known as Warnock tree paint has been used 

 with good results on large trees. It can not be safely used on young 



Fig. 73. — Tools useful in tree surgery. These can be 

 used in removing the dirt from the base of the tree and in 

 cutting out the infected tissue. (Original.) 



trees without injury, nor is it advisable to apply it to any large area 

 of the bark of the treated tree. A good germicide to use in tree surgery 

 work is Bordeaux paste which, as recommended by Professor II. S. 

 Fawcett, is made as follows : 



Bordeaux Paste: Twelve pounds of bluestone (copper sulphate) 

 dissolved in 8 gallons of water in a wooden, earthen or glass vessel ; and 

 24 pounds of quick lime slaked in 8 gallons of water. When the lime 

 is cool, stir together about equal parts by volume of each for making 

 enough mixture to last for one day only. The bluestone is easiest dis- 

 solved by suspending it in a sack at the top of the water overnight. If 

 the bluestone is pulverized and suspended in warm water it dissolves 

 rapidly. Good lime that is not air-slaked should be used, and after 



